I am a printer, and I was born in 1910, and I am composed of a great number of substa

I am a printer, and I was born in 1910, and I am composed of a great number of substances. I consist partly of carbon, and partly of lime, and partly of sulphur, and partly of other things. I am composed of water, and I am hardened by heat. I am composed partly of ammonia, and partly of other things, and I am hardened by the ammonia. I am composed partly of gelatine, and partly of other things, and the